. >> narrator: fisher's organization lobbied successfully for laws that promote vaccine safety. today, a much safer vaccine has replaced dpt. the laws also created a special vaccine court to evaluate and compensate victims of adverse vaccine side effects. >> vaccines are pharmaceutical products that inherently carry a risk of injury or death. and that risk can be greater for some than others, particularly for... for genetic or biological high-risk reasons that have... some of which have been identified and some which have not been identified. >> shame on you, shame on you... >> narrator: surveys show about one-third of americans worry about rare but serious vaccine side effects. but one fear has come to dominate the vaccine war, the fear that vaccines are responsible for autism, a mysterious disorder that appears to be on the rise. the theory that vaccines could cause autism has become well known, partly due to the advocacy of vocal celebrities like jenny mccarthy and jim carrey. >> you're a shining example of unconditional love, and we're so proud to be here. >> jenny, jenny, j